Grate construction



Sept. 8, 1936. Q DAVY' 2,053,703

GRATE CONSTRUCTION Filed Jan. 24, 1935 5 Sheets-Sheet l jg zziW/NR.

. BY J Sept. 8, 1936. c. F. DAVY GRATE CONSTRUCTION 3 Sheets-Sheet 2 Filed Jan. 24, 1935 ATTORNEYS Sept. 8, 1936.

c. F. DAVY 2,053,703 GRATE CONSTRUCTION 5 Sheets-Sheet 5 Filed Jan. 24, 1955 ATTORNEYS,

Patented Sept. 8, 1936 v UNITED STATES PATENT OFFICE invention relates to grates for furnaces and particularlyto grates for-burning fine coal, as buckwheat, rice, and the like, and has for its object a grate construction which can be readily installed in a furnace through the door or doors thereof.

It further has for its object a sectional spider construction including a, sectional grate support which can be placed in the furnace or -removed through the furnace door and withgrate sections mounted between the spider arms of the support and also a sectional spider construction in which each section comprises a hub and radial bars or arms, the hubs being nested together in such a manner that the arms lie in the same plane. Y r

It further has for its object a sectional spider shaker construction which can be assembled in the furnace with'the grate and its support through the furnace door, and also a shaker construction which, upon a small rotary movement, sweeps over the entire area'of the grate, and a shaker construction which, if desired, can be completely after set forth' and claimed.

In describing this invention, reference is had to the accompanying drawings inwhich like'characters designate corresponding parts all the views.

Figure '1 is a plan view of an entire grate structure.

Figure 2 is a sectional view on line 2-2, Figure 1.

Figure 3 is'a'plan view, similar to Figure l, with the upper shaker section removed and someof the grate sections removed.

Figure 4 is a sectional view of the taken on line 4-4, Figure 3. 1

Figure 5 is a fragmentary plan view of the lower section of the spider support.

Figure 6 is a fragmentary plan view of one of the sections of the spider, as the lower section.

Figure 7 is a. fragmentary sectional view, taken on line 'I--I, Figure 1, illustrating the operation entire grate position to the section 'I through the furnace door This grate construction comprises generally a sectional spider support, grate sections mounted 10 "between the spider arms of the support, a sectional shaker in the form of a support rotatably mounted relatively to the grate sections and the sectional spider support, the sections of the supportand the sections of the shaker being so 15 constructed that they can be placed into and removed from the furnace through'the door of the furnace, and the grate sections being so mounted that they can be placed on the arms of the spider support through the furnace door. I and 2 designate the sections of the spider support, the section I, which is the lower section, including a hub 3 having radially extending spider arms or bars 4 extending at an acute angle to each other from diametrically opposite portions thereof, whereby the entire section I is elongated "or "narrow compared with the length, so that it can be inserted endwise through the furnace door and the ends of the arms 4 rested on ledges in the fire box. The section '2 includes a hub 5 and radially extending arms or bars 6 corresponding to the arms '4 and arranged similarly to the arms 4,.-

The'two hubs are nested together so that, when assembled, the arms "of the two sections are spaced equidistantapart and liein the same plane. The hub -5 of the upper section is here shown as nested f'o'ver the hub 3 of "the lower section, and the nested portions are non-circular so as to locate-the sections accurately when being assembled and hold them from shifting out of juxtaposition.

, As here shown, each section I, 2, includes four arms, the section I including four arms 4 and the section 2, four arms 6. The hub 3 of the section I is formed with peripheral recesses I (Figure 6) "whichinterfit with corresponding tongues or projections 8 on the hub '5 of the section 2. The section-I is first placed in position through the furnace door, and then the section 2 placed in juxtawith its hub-5- nested -over the hub 3. The arms of the sections are preferably formed with slots or passages 9 through which air supporting combustion may pass and the ashes may drop, particularly during the operation of the shaker.

l0 designates the grate sections, these being triangular sections, and there being a grate section located between arms of each spider section I or 2 and between the arms of the sections and 2, so that the grate sections cover the entire area of the spider support. These sections ID are arranged with their margins overlapping the margins of the arms of the sections of the spider support and the grate sections are formed with slots through which the air supporting combustion passes and through which the ashes drop, particularly during the operation of the shaker. The slots in the margins of the sections l0 where the grate sections abut against each other are alined with the slots 9 of the arms 4, 6, of the spider support. The grate sections may abut against each other at their edges where they overlie the spider arms and when so placed remain in this position, because any force tending to rotate the entire assembly of grate sections is less than the tendency to remain inert. However, to quickly locate the grate sections l0, they may be mounted between the arms 4, 6 of the spider, and the arms 4, 6 formed with rabbets or ledges l2 in their lateral edges in which the margins of the grate sections rest, these rabbets being of sufficient depth to permit the upper faces of the grate sections to lie flush with the upper faces of the spider arms 4, 6, as seen in Figure 9. In such a construction, the edges of the grate sections ID are not formed with segmental slots, as in Figure l. I

The shaker is of sectional spider construction similar to the section spider construction of the support, so that the sections can be readily assembled with the grate and its support through the furnace door. Each shaker section comprises a hub and radially extending arms or bars extending from diametrically opposite sides of the hub, so that each section is elongated and comparatively narrow, in order that it may be inserted endwise through the furnace door and the hubs are nested together, with the arms of the shaker sections spaced equidistant apart.

l5 designates the hub of one shaker section, as the lower section, and Hi the arms extending from diametrically opposite portions thereof, the hub l5 being formed with a recess or socket H for enclosing a raised annular 'rib IS on the hub 5 of the upper section 2 of the supporting spider 2, and anti-friction members, as balls, '|9 are interposed between the hub 5 and the annular rib |8 or bearing face on the uppe'r side thereof, as seen in Figure '2. A suitable spacer for the balls is located in the recess IT. The shaker arms l6 terminate near the edge of the grate sections and short of the ends of the arms 4, 6, of the spider support, these arms 4, 6 extending far enough to rest on suitable means, as ledges, etc., within the fire box of the furnace.

The hub |5is formed with an axial, upwardlyextending, non-circular projection or portion 2| and a downwardly extending axial stem 22 extending through and rotatably mounted in the hubs 3, 5, of the spider support, the stem 22 having mounted thereon a crank arm 23. The stem 22 and the hub H) are formed with an air passage 24 through which air may be conveyed into the body of the fuel on the grate for the purpose of Supporting combustion and the conduit or tuyere may be mounted on the upper end of the hub 2|.

25 designates the hub of the other or upper section of the shaker, and 26 the arms extending radially therefrom, the hub 25 fitting or nesting over the upwardly projecting portion 2| of the hub l1, and these hubs are so shaped that one is non-rotatably mounted relatively to the other, and, as here shown, the portion 2| is shown as square (Figure 1) and the hub 2| has an opening therein for receiving the portion 2|. The major portion of the hub l5 fits into a recess 21 of the hub 25 in such a manner that the arms 26 and I6 of the sections of the -spider of the shaker all lie in the same plane. These arms are also provided with slots or passages 28 through which air and ashes may pass.

Preferably, as seen in Figure 7, the shaker arms are formed with converging side edges 30 which extend inclined plane fashion or cam fashion to force the ashes through the grate, when the shaker is actuated.

Owing to the sectional construction of the support, grate, shaker and the assembly of the hubs of the support sections and shaker sections, the grate of any size can be assembled in a fire box of a furnace through the furnace door and removed, when necessary, and owing to the shaker construction a small oscillating movement of the shaker causes the shaker arms to sweep over the entire area of the grate or a small movement of the shaker arm causes the totalof the arc of movement of the arms to sweep through an arc What I claim is: V V

1. A grate construction comprising a sectional supporting spider, each section having a hub and pairs of supporting arms extending at acute angles to each other radiallyfrom diametrically opposite portions thereof, whereby each section is narrow compared with its length in order to be thereof, whereby each section is narrow compared with its length, the hub of the shaker sections being nested together and the shaker being rotatably mounted on the hub of one of the sections of the supporting spider, one of the shaker hub sections having a stem extending axially through the hubs of the sections of the supporting spider and being rotatably mounted therein, the arms of the shaker section being movable over the entire flat continuous surface of the grate sections.

2. A grate construction comprising a supporting spider having a central hub and radial arms, a substantially flat grate mounted on the spider arms and forming a continuous fiat floor for supporting the ashes and the fuel, said grate having perforations therethrough, a shaker in the form of a spider having spaced apart radial arms movable over the face of the continuous flat grate and operating, when actuated, to shear the ashes and force them through the perforations of the grate sections.

CHARLES F. DAVY. 

